ELECTRONICS GP 2997378 - Caterpillar

Flexible Coupling - Fig. WH 116 The essential component of the coupling is the flexible section, a molded part of heavy duty Hytrel. The metal parts are placed only in this flexible part.The metal parts to be screwed axially are secured against the flat surface of the flywheel while those to be screwed radially are screwed on the cylindrical hub. Force flow is from the flywheel through the axially mounted metal parts to the flexible section and from there, through the radially mounted segments to the cylindrical drive hub provided on the pump shaft.The coupling is fitted with a clamping hub so that it can be fixed absolutely without backlash on the shaft of the hydraulic pump. Assembly is straightforward, since the flexible part of the coupling is of the slip-on type, and the motor and pump are simply fitted into each other.Assembly
1. Mount the radial segments on the hub and tighten bolts (1) to 220 N m. If the segments are already mounted on delivery, they should not be removed again.2. Push the hub onto pump shaft as far as possible and fix with the two locking screws (2). Tightening torque = 90 N m.3. Bolt the axial segments together with the flexible section to the flywheel and tighten bolts to 220 N m.4. Attach pump assembly to coupling.1. Take care when tightening the bolts (1) that the segments are properly seated (Fig. a wrong, Fig. b right). Apply a little grease to the bolt heads before mounting in order to reduce friction between the bolt heads and segments.2. Use only the "Inbus Plus" bolts supplied, with a colored compound (e.g. blue) on the thread. This compound contains microcapsulated adhesive which cements the bolt in the thread and helps prevent loosening.The curing time of this adhesive after tightenting is approximately 4-5 hours at room temperature (20°C) for an adequate effect. Do not operate coupling beforehand. The adhesive is fully cured after 24 hours. Higher temperatures accelerate hardening, e.g. at 70°C (heat with hot air blower) the curing time is only 15 minutes."Inbus Plus" is temperature resistant from -80 to +90°C and the bolts can be used, at most, three more times. Should for some reason or other these "Inbus Plus" bolts not be available, the threaded holes and the bolts must be carefully degreased and securely cemented with a different, reliable adhesive, e.g. "Loctite". Lock washers, or suchlike are not permissible.Hydraulic Oil Reservoir
Hydraulic Oil Reservoir - Fig. WH 206 (1) Breather filter with double check valve Response pressure of outlet valve 0.35 bar (35 kPa)Response pressure of inlet valve -0.03 bar (-3 kPa)(2) Check valves act as back pressure valves, opening pressure 2.5 bar (250 kPa)(3) Integrated filter with bypass valve(4) Sight glassesThe hydraulic oil reservoir is pressurized, i.e. the air above the oil level has an overpressure of 0.35 bar (35 kPa). This improves the intake characteristics of the hydraulic pump.For oil quantity, type and change intervals see the topic, Lubrication and Maintenance Chart and Refill